#include "OgreStableHeaders.h"

#include "OgreDynLib.h"

#include "OgreException.h"
#include "OgreLogManager.h"

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
#define WIN32_LEAN_AND_MEAN
#if !defined (NOMINMAX) && defined(_MSC_VER)
#define NOMINMAX
#endif
#include <windows.h>
#endif

#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE || OGRE_PLATFORM == OGRE_PLATFORM_IPHONE
#include "macUtils.h"
#include <dlfcn.h>
#endif

namespace Ogre
{
	DynLib::DynLib(const String& name)
	{
		mName = name;
		m_hInst = NULL;
	}

	DynLib::~DynLib()
	{
	}

	void DynLib::load()
	{
		LogManager::getSingleton().logMessage("Loading library " + mName);

		String name = mName;
#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX || OGRE_PLATFORM == OGRE_PLATFORM_TEGRA2
		if (name.substr(name.length() - 3, 3) != ".so")
			name += ".so";
#elif OGRE_PLATFORM == OGRE_PLATFORM_APPLE
		if (name.substr(name.length() - 6, 6) != ".dylib")
			name += ".dylib";
#elif OGRE_PLATFORM == OGRE_PLATFORM_WIN32
		if (name.substr(name.length() - 4, 4) != ".dll")
			name += ".dll";
#endif
		m_hInst = (DYNLIB_HANDLE)DYNLIB_LOAD(name.c_str());

		if (!m_hInst)
			OGRE_EXCEPT(
				Exception::ERR_INTERNAL_ERROR,
				"Could not load dynamic library " + mName +
				". System Error: " + dynlibError(),
				"DynLib::load");
	}

	void DynLib::unload()
	{
		LogManager::getSingleton().logMessage("Unloading library " + mName);

		if (DYNLIB_UNLOAD(m_hInst))
		{
			OGRE_EXCEPT(
				Exception::ERR_INTERNAL_ERROR,
				"Could not unload dynamic library " + mName +
				". System Error: " + dynlibError(),
				"DynLib::unload");
		}
	}

	void* DynLib::getSymbol(const String& strName) const throw()
	{
		return (void*)DYNLIB_GETSYM(m_hInst, strName.c_str());
	}

	String DynLib::dynlibError(void)
	{
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
		LPVOID lpMsgBuf;
		FormatMessage(
			FORMAT_MESSAGE_ALLOCATE_BUFFER |
			FORMAT_MESSAGE_FROM_SYSTEM |
			FORMAT_MESSAGE_IGNORE_INSERTS,
			NULL,
			GetLastError(),
			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
			(LPTSTR)&lpMsgBuf,
			0, 
			NULL);
		String ret = (char*)lpMsgBuf;
		LocalFree(lpMsgBuf);
		return ret;
#elif OGRE_PLATFORM == OGRE_PLATFORM_LINUX || OGRE_PLATFORM == OGRE_PLATFORM_APPLE || OGRE_PLATFORM == OGRE_PLATFORM_TEGRA2
		return String(dlerror());
#else
		return String("");
#endif
	}
}
